☆ Before jumping in to do as the error message suggests, let's think for a moment about what that entails.

☆ Inspect every Receive and Send shape to determine if it uses a Message variable that's associated with the schema you want to change.

☆ Its not a good practice to create a single orchestration with so many Receive/Send shapes.

☆ Delete Port connections, once you find all the Receive/Send shapes.

☆ Change the Message variable so that the Message Type property is set to the new schema and then re-associate the Message variable with each Receive/Send shape.

☆ Find all the Port Types that are associated with the Ports you disconnected from Receive/Send shapes and reset their Operation's Message Type properties.

☆ Use a Multi-Part Message Type to wrap the underlying schema. It's flexible and saves time in the long run.